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G. T. LADD.

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APPLICAHON F|LED FEB. 28. HHG. 1,326,203. Patentcd Dee. 30,1919.

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APPLICATION msn Fmze. ms. 1,326,203. Patented Dec. 30,1919.

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INVENTOR WITNESSES G. T. LADD.

BOILER.

l APPLICATION FILED FEB. 28,1916.

1 ,326,203. Patented Deo. 30,1919.

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BOILEB.

, APPLscATmN man fss.28.191s. 1,326,203..y Patented Da. 30,1919 4 SHEETS-SHEET 4.-

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WITNESSES INVENTQR UNITED STATES PATENT OFFICE.

GEORGE T. LADD, OF PITTSBURGH, PENNSYLVANIA.

sorter..

specification of Letters raten.

Patented Dec. 30, 1919.

Application led February 28, 1918.' Serial No. 80,947.'

To all who/1t zt'may concern.'

Be it.known that. l, (i1-:onor: T. Lann, residing -at Pittsburgh, in the county of Allegheny and State of Pennsylvania, aAcitizen of the United States,'lia\'e invented or dis- `covered certain new and useful Improvechamber. In such a construction there-is a great loss otheat by radiation' from said walls'. Inthe multiple-unit type of vertical water .tube boilers, the fire box or combustion chamber is generally located between' two adjacentP units,which therefore form two sides of the fire or combustion chamber. But there is a great loss of heat by radiation from the end walls of the fire or combustion chamber. l

The invention described herein has for its object, the arrangement of a portion of the heating members in such a position in the combustion chamber as to utilize the heat heretofore lost by radiation, in the generation of power. The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification, Figure 1 is a view partly in front elevation and partly in section of a vertical water tube boiler embodying my improvement; Fig. 2 is a sectional elevation, the plane of section being at right'anglesto the axes of thedrums Figa 3 is a sectional plan view. the .plane ofsection being indicated bythe line III-Hl Fig. 1; Fig. 4 is a sectional elevation of a multiple unit vertical Water tube boiler embodying my improvement, the plane of section being indicated by the line IV-IV Fig. 5; Fig. 5 is a Sectional elevation on a plane indicated bythe line V-V Fig. 4: Fig. 6 is a sectional detail illustrating u modification of my improvement. and Fig. 7 is a sectional plan view on a plane indicated by the line VII-VII Fig. 6.

l'Vhile in the practice of my invention, it

preferred toemploy tbe construction of boiler setting a'nd'combustion chamber described and shown in an application filed of `ven date herewith, it will be understood that as regards its broader features my improvement can be embodied in other forms or constructionsof boilers, and the broad terms of the claims are not limited to any specific construction. of combustion chamber or fire box.

In the construction shown in-Fi s. 1, 2'

and 3, the boiler proper consists o upper and lower drums 1 and 2, which are connected b three sets f tubes, 3, 4 and 5.

-This boi er is inclosed on the rear and two sides within suitable walls as is customary, and the front of the setting is constructed to provide a suitable fire box or combustion chamber. While not necessary to the successful employment of the invention de' scribed .and claimed herein, it is. preferred lto make a high combustion chamber as shown-in Figs. 1 and 2, and described and Aclaimed in an application filed February 28,

1916, Serial No. 80948, Patent No. 1283814..-

As shown, the combustion chamber is'sol constructed that the highest part of the arch 6, forming the. top of the chamber is in or approximately in a level with the axis It will be' readily of the upper drum 1. understood by those skilled in the art, that the front and side walls of a combustion chamber whether of the high or low arch type are veryv highly heated and consequently there will be a great loss of heat by radiation from said walls. utilize in part at least, the heat now lost, provision is made for arranging a supe`rheater in suitable relation to one or more of the walls dependent upon4 the size of the boiler and the relative capacities of' the boiler and superheater.

A. desirable construction of the wallof the lire box .and arrangement ofsuperheater consists in providing an open topped pocket 7 for the reception of the superhfeater 8, WK

In order to I ich may be of any desired construction.

This pocket is formed by extending the side 'walls so that the upper portion 9 ot the front wall will extend beyond the lower portion 10 and building up on the 4glatter, a screen wall 11, a suitable distance inside the portion 9 of the front wall. yAs shown in Figs. 1 and 2, this screen wall does not extend to the top of the combustion chamber',

chamber units as shownjln Figs. 4 and', the pockets with the s'uperheater will be reduced in teuiperature, thereby reducing the pressure in the pocket, so' that the gases will flow into the upper end of thel pocketdown along the superheater tubesand then back into the combustion chamber through openings 12 in the screen wall 11. f Asshown -in Figs. .1, 'i

2, 4 and 5, a plurality of ol'ienngs ofdifferent lieights may formed through the screen wall, or they gases may escape -froui 7 for the `superheater,'are airai'iged outside Jf one Orbothfend walls of the combustion chamber are .and that the h'ambe anti an opening lflfjisr formed -through the. end wall Lfoiwthe passage of the hot gasesinto theupper ends ofthe' pockets, and'said end walls which -intliis' constriicthe sci'een walls provided tion become. with openings 12'01 with d aiiii ings 12 for theflow'of ga.

pockets` back ,into the combusti() Itv 'is' characteristic-of'l nl)4 .iii l that the wall or Walls ,othef'co protected by the siii latter rare to a' :larg heated by heat units hereto the 4flow of gases through the,

bei-'1E4 lbein .pocketgxti'e -top of said pocket beingunobstructed andlocated a substantial distance :my hand.

further the gases, which contact with the superheater are regenerated before reaching the tubes or other surfaces of the boiler.

I am aware that it is old to arrange super-heating coils in la pocket outside of the wall of a combustion chamber for a boiler, said chamber narrowing progressively t0- ward its upper end and having in its outer vwall for the flowing of products of combustion' into the super-heater, a pocket from which the gases escape through an outlet traversed by the upper ends of'the boiler tubes.

I claim herein as my invention: 1 In a boiler of: the vertical water tube type, the combination of a combustion chamber,` one of the inclosng walls of said chamber being provided with a pocketl provided with openings into the combustion chamber permitting of tlieflow of products of comtlirough the pocket and back into the coinbustioii chamber, and a superheater ar-4 ranged in said pocket.

2. In a boiler of the vertical water tube type, the combination of a combustion chaniher, one of the inclosing walls of the champrovided with an open-topped 'lielow-'the-top' of the combustion chamber,

th-innerwalloftlie pocket being provided .,withqppenings for the f .lowjof gases into the combustion chamber; and a superheater arranged in sa id pocket.

In. testimony whereof, I have vhereunto" set v bustion from the combustion cliamber'dow GEORGE T. LAD'D. 

